| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 17.2466 |
| 2021 | 17.6681 |
| 2020 | 18.0251 |
| 2019 | 18.2615 |
| 2018 | 18.3906 |
| 2017 | 18.4047 |
| 2016 | 18.3475 |
| 2015 | 18.3566 |
| 2014 | 18.3609 |
| 2013 | 18.3273 |
| 2012 | 18.3062 |
| 2011 | 18.337 |
| 2010 | 18.4546 |
| 2009 | 18.6124 |
| 2008 | 18.8229 |
| 2007 | 19.1209 |
| 2006 | 19.5435 |
| 2005 | 20.2487 |
| 2004 | 21.141 |
| 2003 | 21.9967 |
| 2002 | 22.8898 |
| 2001 | 23.7835 |
| 2000 | 24.5339 |
| 1999 | 25.174 |
| 1998 | 25.7522 |
| 1997 | 26.3812 |
| 1996 | 27.0259 |
| 1995 | 27.5391 |
| 1994 | 27.9624 |
| 1993 | 28.2863 |
| 1992 | 28.5243 |
| 1991 | 28.7541 |
| 1990 | 28.8844 |
| 1989 | 29.0277 |
| 1988 | 29.4094 |
| 1987 | 29.8993 |
| 1986 | 30.4895 |
| 1985 | 31.3185 |
| 1984 | 32.3075 |
| 1983 | 33.3927 |
| 1982 | 34.3054 |
| 1981 | 35.1058 |
| 1980 | 36.1255 |
| 1979 | 37.253 |
| 1978 | 38.6025 |
| 1977 | 39.8689 |
| 1976 | 40.3521 |
| 1975 | 40.3375 |
| 1974 | 40.2694 |
| 1973 | 40.2594 |
| 1972 | 40.5061 |
| 1971 | 40.7591 |
| 1970 | 40.8932 |
| 1969 | 41.0523 |
| 1968 | 41.1376 |
| 1967 | 41.347 |
| 1966 | 41.5483 |
| 1965 | 41.4825 |
| 1964 | 41.2412 |
| 1963 | 40.6515 |
| 1962 | 40.0112 |
| 1961 | 39.9865 |
| 1960 | 40.3447 |